Police investigating the disappearance of RAF gunner Corrie McKeague have "explored all reasonable lines of inquiry", a review has found.

Mr McKeague, 23, from Dunfermline, Fife, went missing after a night out with friends in Bury St Edmunds, Suffolk, in September last year.

Police said their search of a landfill site at Milton near Cambridge, which resumed on Monday, will continue and is anticipated to last four to six weeks.

A review of the force's investigation to date was conducted by the East Midlands Special Operations Unit and has now been completed, with a report passed to Suffolk Police.

A spokesman for the force said: "The report concludes that police have conducted a thorough, methodical and detailed investigation and explored all reasonable lines of inquiry with no new further leads needing to be pursued.

"The review also concludes that Corrie is most likely to be in the Milton landfill site and the review also supports the continued search of the eastern end of cell 22 at the Milton landfill site, which began on Monday."

A five-month search of the landfill site was called off in July after no evidence of his body was found.

The latest search is focusing on an area next to the site of the earlier search.

Mr McKeague's mother, Nicola Urquhart, wrote on Friday that officers had found nothing in the first week of the resumed search.

She said: "The search this week has been negative with no trace of Corrie or his belongings."

Mr McKeague was last seen in the area of Bury St Edmunds known as the Horseshoe, where there was a bin lorry collection at around 4.15am to 4.20am on Saturday, September 24, 2016.

It then took a route that coincided with the movements of the airman's phone.

The bin lorry linked to Mr McKeague's disappearance was initially thought to have collected a 24lb (11kg) load but police said it was later found to be more than 220lb (100kg).

Mr McKeague's girlfriend, April Oliver, announced in June that the missing serviceman had become a father with the birth of their daughter.